2604905 has 4 divisors (see below), whose sum is σ = 3125892. Its totient is φ = 2083920.

The previous prime is 2604887. The next prime is 2604907. The reversal of 2604905 is 5094062.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5094062 = 2 ⋅2547031.

It can be written as a sum of positive squares in 2 ways, for example, as 851929 + 1752976 = 923^2 + 1324^2 .

It is not a de Polignac number, because 2604905 - 2¹² = 2600809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2604907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260486 + ... + 260495.

It is an arithmetic number, because the mean of its divisors is an integer number (781473).

2^2604905 is an apocalyptic number.

It is an amenable number.

2604905 is a deficient number, since it is larger than the sum of its proper divisors (520987).

2604905 is an equidigital number, since it uses as much as digits as its factorization.

2604905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520986.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2604905 is about 1613.9718089236. The cubic root of 2604905 is about 137.5933030644.

Adding to 2604905 its reverse (5094062), we get a palindrome (7698967).

The spelling of 2604905 in words is "two million, six hundred four thousand, nine hundred five".